Protective casing



FIG. 1 is a perspective view of a protective casing showing our design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side, elevational view thereof;

FIG. 5 is a right side, elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is another perspective view of the protective casing in FIG. 1, with a support stand rotated.

The broken lines of all the figures are for the purpose of illustrating environmental structures and form no part of the claimed design. 

The ornamental design for a protective casing, as shown and described. 